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Author
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Topic: GT 40 heads.........
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powrshftr
Journeyman Posts: 77
From: Sarnia,Ontario,Canada
Registered: Apr 2003
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posted 01-10-2004 11:46 PM
   
Will I be wasting my time trying to get a set of iron GT 40's to flow #'s in the ballpark of 250cfm int./200cfm ex.?Recently got a deal on a set and was hoping to squeeze some power out of them with a little grinding.Hoping to use them on the turbo 306ci motor;shooting for the 550-580hp area with 10psi boost,and the x303 cam.Am I off my freakin' rocker,or will it be a slam dunk?Please be gentle.LOL!------------------
DRIVE IT LIKE YOU STOLE IT!!!!!!!!!!!
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 01-10-2004 11:49 PM
If you got souch a great deal on them, sell them and use the profits for some serious heads. Edelbrock, AFR, etc.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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TomP
Gearhead Posts: 5761
From: Delta BC Canada
Registered: Dec 99
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posted 01-10-2004 11:56 PM
I agree with Alex. The GT40 has no more potential after porting than a normal 5.0L head as the castings are very similar.
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CHIPSBAD67
Gearhead Posts: 396
From: LOU,KY;USA
Registered: Sep 2003
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posted 01-11-2004 12:01 AM
the more power you can make n/a, the more you'll make when you add the turbo. how much did you get the gt-40's for? ------------------
306, 4speed, 4.11's....best 1/8 mile 7.58 at 92mph with 1.72 60ft. PUMP GAS/NO ADDERS/STREET TIRES
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capri man
Gearhead Posts: 6417
From: doerun, ga.
Registered: Nov 2000
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posted 01-11-2004 01:34 PM
dont know if this will help or how accurate it is but here it is anyway. i just stumbled up on it.
http://phystutor.tripod.com/stang/head_swapping.html------------------
mike r
racing is real
everything else is just a game.
81 capri-7.47 @90mph 1/8
1.54 60 ft. http://www.angelfire.com/ny5/billswebsite/pg06.html
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capri man
Gearhead Posts: 6417
From: doerun, ga.
Registered: Nov 2000
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posted 01-11-2004 01:38 PM
heres another one.
http://www.allfordmustangs.com/Detailed/630.shtml------------------
mike r
racing is real
everything else is just a game.
81 capri-7.47 @90mph 1/8
1.54 60 ft. http://www.angelfire.com/ny5/billswebsite/pg06.html
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powrshftr
Journeyman Posts: 77
From: Sarnia,Ontario,Canada
Registered: Apr 2003
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posted 01-11-2004 02:57 PM
Thanks CapriMan!
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JCQuinn@work
Gearhead Posts: 826
From: Lakewood, CO, USA
Registered: Jun 2001
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posted 01-12-2004 10:44 AM
The GT40 does flow better than standard 302 heads but not as well as aftermarket heads. Here is a source for comparative flow numbers. It isn't inclusive of some of the newer heads but is very informative.http://www.jason.fletcher.net/tech/flowdata/castiron.htm John
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